(a) Thermal protection. The thermal protective aid must be designed to protect against loss of body heat as follows:

(1) The thermal conductivity of the material from which the thermal protective aid is constructed must be not more than 0.25 W/(m−°K).

(2) The thermal protective aid must prevent evaporative heat loss.

(3) The aid must function properly at an air temperature of −30 °C (−22 °F) to + 20 °C (68 °F).

(b) Donning Time. Each thermal protective aid must be designed to enable a person to don the aid correctly within one minute after reading the donning and use instructions described in § 160.174-15(a).

(c) Storage Temperature. A thermal protective aid must not be damaged by storage in its storage case at any temperature between −30 °C (−22 °F) and + 65 C (149 °F).

(d) In water performance. The thermal protective aid must be designed to permit the wearer to remove it in the water within two minutes, if it impairs ability to swim.

(e) Water penetration. The fabric from which the thermal protective aid is constructed must maintain its watertight integrity when supporting a column of water 2 meters high.

(f) Oil resistance. Each thermal protective aid must be designed to be useable after 24 hours exposure to diesel oil.